add SIOplus i/o scheduler

Signed-off-by: Dan Trifan <jimsth@gmail.com>
defconfig: enable SIOPLUS ioscheduler

Signed-off-by: Dan Trifan <jimsth@gmail.com>
block: Alphabetize IO Schedulers

* I know it bugs people when things aren't orderly.  It bugs me too.....

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
Signed-off-by: Dan Trifan <jimsth@gmail.com>